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        <h2 id="u767E_u4E07_u7EA7_u522B_u6570_u636E_u5BFC_u51FA"><a href="#u767E_u4E07_u7EA7_u522B_u6570_u636E_u5BFC_u51FA" class="headerlink" title="百万级别数据导出"></a>百万级别数据导出</h2><p>　　1. 直接查询所有的数据导出，在ResultSet rs = st.executeQuery（）执行后内存溢出，分析得知，所有的查询结果都会加载到ResultSet，百万级的数据，直接溢出<br>　　2. 导出时，不进行任何order操作，直接全表导出。如果采用关键字limit offset分页查询，每页2000条记录，在前几百页，性能不错。越往后面，速度越慢，几乎达到了每次查询耗时一秒的消耗。<br>　　3. 导出时，进行order操作，即使order字段上建立了索引，采用statement，后期很慢，甚至出现卡死情况（测试了多次，分页达到600左右的时候出现问题）。<br>　　4. 导出时，进行order操作，即使order字段上建立了索引，采用PrepareStatement，后期仍然很慢，但是没有出现卡死的情况（只测试了一次）。耗时约40分钟。<br>　　5. 每次翻页的时候记录一下最后一条记录的id号，然后select top 10 * form tablename where id&gt;xxx，这样即使数据量再大也不怕（未测试）</p>
<h2 id="u6811_u5F62_uFF08_u9012_u5F52_uFF09_u67E5_u8BE2"><a href="#u6811_u5F62_uFF08_u9012_u5F52_uFF09_u67E5_u8BE2" class="headerlink" title="树形（递归）查询"></a>树形（递归）查询</h2><p>　　测试如下：<br><figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="operator"><span class="keyword">create</span> <span class="keyword">table</span> tb(<span class="keyword">id</span> <span class="built_in">varchar</span>(<span class="number">3</span>) , pid <span class="built_in">varchar</span>(<span class="number">3</span>) , <span class="keyword">name</span> <span class="built_in">varchar</span>(<span class="number">10</span>));</span> </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'002'</span> , <span class="number">0</span> , <span class="string">'浙江省'</span>);</span> </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'001'</span> , <span class="number">0</span> , <span class="string">'广东省'</span>);</span> </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'003'</span> , <span class="string">'002'</span> , <span class="string">'衢州市'</span>);</span>  </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'004'</span> , <span class="string">'002'</span> , <span class="string">'杭州市'</span>) ;</span> </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'005'</span> , <span class="string">'002'</span> , <span class="string">'湖州市'</span>);</span>  </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'006'</span> , <span class="string">'002'</span> , <span class="string">'嘉兴市'</span>) ;</span> </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'007'</span> , <span class="string">'002'</span> , <span class="string">'宁波市'</span>);</span>  </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'008'</span> , <span class="string">'002'</span> , <span class="string">'绍兴市'</span>) ;</span> </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'009'</span> , <span class="string">'002'</span> , <span class="string">'台州市'</span>);</span>  </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'010'</span> , <span class="string">'002'</span> , <span class="string">'温州市'</span>) ;</span> </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'011'</span> , <span class="string">'002'</span> , <span class="string">'丽水市'</span>);</span>  </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'012'</span> , <span class="string">'002'</span> , <span class="string">'金华市'</span>) ;</span> </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'013'</span> , <span class="string">'002'</span> , <span class="string">'舟山市'</span>);</span>  </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'014'</span> , <span class="string">'004'</span> , <span class="string">'上城区'</span>) ;</span> </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'015'</span> , <span class="string">'004'</span> , <span class="string">'下城区'</span>);</span>  </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'016'</span> , <span class="string">'004'</span> , <span class="string">'拱墅区'</span>) ;</span> </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'017'</span> , <span class="string">'004'</span> , <span class="string">'余杭区'</span>) ;</span> </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'018'</span> , <span class="string">'011'</span> , <span class="string">'金东区'</span>) ;</span> </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'019'</span> , <span class="string">'001'</span> , <span class="string">'广州市'</span>) ;</span> </span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> tb <span class="keyword">values</span>(<span class="string">'020'</span> , <span class="string">'001'</span> , <span class="string">'深圳市'</span>) ;</span></span><br></pre></td></tr></table></figure></p>
<p>　　测试语句，查询浙江省及以下县市：<br><figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">with RECURSIVE cte as </span><br><span class="line">( </span><br><span class="line">    <span class="operator"><span class="keyword">select</span> a.<span class="keyword">id</span>,a.<span class="keyword">name</span>,a.pid <span class="keyword">from</span> tb a <span class="keyword">where</span> <span class="keyword">id</span>=<span class="string">'002'</span> </span><br><span class="line">    <span class="keyword">union</span> all  </span><br><span class="line">    <span class="keyword">select</span> <span class="keyword">k</span>.<span class="keyword">id</span>,<span class="keyword">k</span>.<span class="keyword">name</span>,<span class="keyword">k</span>.pid  <span class="keyword">from</span> tb <span class="keyword">k</span> <span class="keyword">inner</span> <span class="keyword">join</span> cte <span class="keyword">c</span> <span class="keyword">on</span> <span class="keyword">c</span>.<span class="keyword">id</span> = <span class="keyword">k</span>.pid </span><br><span class="line">)<span class="keyword">select</span> <span class="keyword">id</span>,<span class="keyword">name</span> <span class="keyword">from</span> cte;</span></span><br></pre></td></tr></table></figure></p>
<p>　　输出：<br> id  |  name<br>—–+——–<br> 002 | 浙江省<br> 003 | 衢州市<br> 004 | 杭州市<br> 005 | 湖州市<br> 006 | 嘉兴市<br> 007 | 宁波市<br> 008 | 绍兴市<br> 009 | 台州市<br> 010 | 温州市<br> 011 | 丽水市<br> 012 | 金华市<br> 013 | 舟山市<br> 014 | 上城区<br> 015 | 下城区<br> 016 | 拱墅区<br> 017 | 余杭区<br> 018 | 金东区<br>(17 rows)</p>
<p>　　如果想按层次分别显示出来，也可以这么写<br><figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">with RECURSIVE cte as</span><br><span class="line">(</span><br><span class="line"><span class="operator"><span class="keyword">select</span> a.<span class="keyword">id</span>,<span class="keyword">cast</span>(a.<span class="keyword">name</span> <span class="keyword">as</span> <span class="built_in">varchar</span>(<span class="number">100</span>)) <span class="keyword">from</span> tb a <span class="keyword">where</span> <span class="keyword">id</span>=<span class="string">'002'</span></span><br><span class="line"><span class="keyword">union</span> all </span><br><span class="line"><span class="keyword">select</span> <span class="keyword">k</span>.<span class="keyword">id</span>,<span class="keyword">cast</span>(<span class="keyword">c</span>.<span class="keyword">name</span>||<span class="string">'&gt;'</span>||<span class="keyword">k</span>.<span class="keyword">name</span> <span class="keyword">as</span> <span class="built_in">varchar</span>(<span class="number">100</span>)) <span class="keyword">as</span> <span class="keyword">name</span>  <span class="keyword">from</span> tb <span class="keyword">k</span> <span class="keyword">inner</span> <span class="keyword">join</span> cte <span class="keyword">c</span> <span class="keyword">on</span> <span class="keyword">c</span>.<span class="keyword">id</span> = <span class="keyword">k</span>.pid</span><br><span class="line">)<span class="keyword">select</span> <span class="keyword">id</span>,<span class="keyword">name</span> <span class="keyword">from</span> cte ;</span></span><br></pre></td></tr></table></figure></p>
<p> id  |         name<br>—–+———————-<br> 002 | 浙江省<br> 003 | 浙江省&gt;衢州市<br> 004 | 浙江省&gt;杭州市<br> 005 | 浙江省&gt;湖州市<br> 006 | 浙江省&gt;嘉兴市<br> 007 | 浙江省&gt;宁波市<br> 008 | 浙江省&gt;绍兴市<br> 009 | 浙江省&gt;台州市<br> 010 | 浙江省&gt;温州市<br> 011 | 浙江省&gt;丽水市<br> 012 | 浙江省&gt;金华市<br> 013 | 浙江省&gt;舟山市<br> 014 | 浙江省&gt;杭州市&gt;上城区<br> 015 | 浙江省&gt;杭州市&gt;下城区<br> 016 | 浙江省&gt;杭州市&gt;拱墅区<br> 017 | 浙江省&gt;杭州市&gt;余杭区<br> 018 | 浙江省&gt;丽水市&gt;金东区</p>
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